Centrifugal governor



June 27, 1933. 'REHM AL 1,916,182

CENTRIFUGAL GOVERNOR Filed Dec. 5, 1931 Patented June 27, 1933 'YNITED STATES PJATENT OFFICE ALFRED REHM AND KARL SCHWEIZEB, OF STUTTGABT, GERMANY, ASSIGNOBS '10 ROBERT BOSCH AKTIENGESELLSCHAFT, OF ST'UTTGABT, GERMANY CENTRIFUGAL GOVERNOR a lication filedDecember s, 1931, Serial no.

. This invention relates'to improvements in automatic centrifugaligovernors suitable for controlling the ignition moment of internal combustion engines amongst other uses, of the type in which a plurality of centrifugal weights are adapted to displace an element to he adjusted which is under the action of a spring or the like resilient force, said centrifugal weights being adapted to operate on the element through lever arms of differing lengths so that the weights have difi'ering mechanical advantage over said element.

Now an automatic control of this type gives an adjustment curve, which after a rapid rise up to about half of the total adjustment has a sharp bend and then further slowly rises. Thisadjustment curve is certainly suitable for many engines, but there are also engines in which the rapid adjustment up to half the total adjustment causes the known ignition knocking. To obtain a curve, which has, at first, the same rapid rise, but bends earlier and more gradually into the slowly rising branch, according to this invention the force of a spring acts in opposition to the movement of the centrifugal weight which acts with a short lever arm on a long lever arm of the cam.

An example of construction of the invention is shown an the drawing, in which Figure 1 shows a centrifugal governor partly in longitudinal section.

Figure 2. a plan view of a centrifugal governor in the position of repose.

()n the driving-shaft 1 is secured a collar 2, and on this collar the base-plate 3 of the governor, in which two pins 4, 5, are secured.

Two centrifugal weights 6 and 7 can swing about these pins as axes of rotation. The centrifugal weight 6 has a long arm 8, which presses against the short arm 9 of a twoarmed lever 11 firmly connected with the cam 10 of the interrupter. The centrifugal weight 7 has a short arm 12 which presses against the long arm 13 of the lever 11. To the cam 10 is also firmly connected the disc 14. This latter has two arms 15 and 16, which have specially shaped surfaces 19 and 20 for the transverse deflection of the spiral springs 17 and 18. These springs are each suspended 579,332, and in Germany December 13, 1980.

between a pin 21, 22 respectively on the baseplate and a point 23, 24 on the disc 14. A

spring 50 of steel wire is looped round a rivet 51 secured to the base-plate 3, and bears the spring 50 for such a length of time .until the weight reaches the stodp 22, where its centrifugal force is sto pe wards, the governor unctions, as the speed From then onv increases, exactly as in the case of governors of the said known type.

It is obvious that instead of a steel wire spring of the form shown, a leaf-spring could I also beemployed in a suitable arrangement. Ifrequired also, the arrangement may be such that the spring 50 begins to opposethe displacement of the weight associated with it not right away from the position of repose of the governor, but only after a certain displacement of the weight. We declare that what we claim is:

1. A centrifugal governor comprising a plurality of weights, lever arms of differing length displaced thereby, an element displaced by said lever arms under the action of centrifugal force on said weights, a counter spring for resiliently restraining said element from displacement and a spring-opposing the'action of the weight efi'ecting dis placement of the shortest lever arm.

'2. A centrifugal governor comprising a base plate, a plurality of weights pivoted on said base plate, lever arms of differing length displaced thereby, an element displaced by said lever arms under the action-of centrifugal force on said weights, a counter-spring for resiliently restraining said element for displacement, and a second spring having a loop mounting intermediate its ends on said base plate and free terminals engaging said base plate and one of said weights respectively.

3. An automatic ignition control for internal combustion engines comprising an angularly displaceable interrupter cam, resilient means tending to restrain said cam from angular displacement, two independently operating centrifugal weights and lever mechanisms adapted to transmit movement separately from said weights to said cam in a direction angularly displacing said cam and so arranged that one of said weights operates on said cam with greater mechanical advantage than the other, stop means for limiting the centrifugal movement of said one weight and spring means opposing the centrifugal movement of said one weight, the other of said weights having an effective range of action on said cam beyond the limited movement of said one weight.

4. An automatic ignition control for internal combustion engines comprising an angularly displaceable interrupter cam, resilient means tending to restrain said cam from angular displacement, at least two centrifugal weights having lever arms of differing lengths for angu arly displacing said cam, and a spring member opposing the action of the weight with the shorter lever arm.

imams 5. An automatic ignition control for internal combustion engines comprising a base plate, an angularly displaceable interrupter cam, resilient means tending to restrain said cam from angular displacement, at least two centrifugal weights pivoted on said base plate and having lever arms of differing lengths for angularly displacing said cam, and a spring engaging saidbase plate and the centrifugal weight with the shorter lever arm in a manner opposing the centrifugal action of said weight.

6. An automatic ignition control for internal combustion engines comprising a base plate, a displaceable interrupter cam, resilient means tending to restrain said cam from angular displacement, at least two centrifugal weights pivoted on said base plate and having lever arms of differing lengths for angularly displacing said cam, and a spring having a loop mounting intermediate its ends on said base plate and angularly disposed terminals engaging said base plate and the centrifugal weight with the shorter lever arm in a manner opposing the centrifugal movement of said weight.

In testimony whereof we have hereunto aflixed our signatures.

ALFRED REHM. KARL SCHWEIZER. 

